$\frac{-x^4}{x^2+1}$
$7a+14a^2$
$-3x-4<8$
$15x+13x-11y-2x-7y+2x-17x$
$\int\:\frac{x^3+2x^2+x-3}{x^4+8x^2+16}dx$
$1312^2$
$6\cdot10^3$
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